Display screen or portion thereof with graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with a graphical user interface showing the new design;

FIG. 2 is a front view of a second embodiment thereof;

FIG. 3 is a front view of a third embodiment thereof;

FIG. 4 is a front view of a fourth embodiment thereof;

FIG. 5 is a front view of the design shown in FIG. 1 but in a different broken line environment;

FIG. 6 is a front view of the design shown in FIG. 2 but in a different broken line environment;

FIG. 7 is a front view of the design shown in FIG. 3 but in a different broken line environment; and,

FIG. 8 is a front view of the design shown in FIG. 4 but in a different broken line environment.

The broken lines corresponding to mobile devices and display screens form no part of the claimed design. The remaining broken lines illustrate portions of a graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 